Improved railway-car spring



P. G. -GARDINEFL Car Spring.

Patent@ July 6, 1869.l

UNITED STATES PERRY e. GARDINER,

0E NEW YoRK, N. Y.

IMPROVED RAILWAY-CAR SPRING.

v Specification forming part of Letters Patent No.'92,182, dated July 6,1869.

V.of several elastic substances, such as wool,

hair, cork, sponge, cotton, or similar articles, with which the centralpart of a cylindrical india-rubber tube is iilled under pressure, whensaid india-rubber tube is surrounded by a spiral metal spring to aid ingiving increased strength and elasticity to the spring to retain theindiarubber tube -or spring in form, and to force the same between thecoils of the metal spring, and thus restrain the same from .snapping orinjury.

In the accompanying drawings, A represents an india-rubber tube orcylinder, surrounded by a spiral metal spring, B. The central part, orthe hollow space of the tube or cylinder A is illed, under a pressureot' two thousand (2,000) pounds, more or less, with any elastic,iiexible substance, or with several of them combined, such as cotton,sponge, cork, hair,

tween the coils of the metal spring, and thel greater the load placedupon the whole spring,

Vthe more the india-rubber will be forced between the coils, preventingthereby the metal spring from snapping or from being otherwise injured,and at the same time increasing the strength of the spring materially.

If the weight and the amount of material contained in this spring areconsidered in relation to its power, we find that no other spring, orcombination of springs, can compare with the same.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination, with an india-rubber hollow cylinder surrounded byaspiral spring, of an elastic substance or substances, such as wool,cotton, hair, sponge, cork, or equivalent fibrous material, eithersingly or several of them combined, forced under pressure into thecentral hollow space of the india-rubber tube, in the manner and for thepurpose substantiall y as specified.

Witnesses: P. G. GARDINER. HENRY E. RoEDER, NATHANLEL LUNDIE.

